Umm, some of the flee-bay ones are plastic and snap, like mine did, such a poor pathetic design (make sure you check).

I phoned "redline-performance" and was pointed in the direction of Evotech Performance for a super fast next day delivery of a CNC Aluminium part that included number plate bolts and legal reflector complete with additional reflector bracket and detailed instructions (for those that need).
The bracket is even profiled with the step to fit the recess under the rear seat perfectly.
Absolutely top class service and it's all on and ready to go.